The protective measures for sine wave inverter power supply mainly include the following aspects:
Electrical protection:
Short circuit protection: This is a very important protective measure. When a short circuit fault occurs in the electrical circuit, the short-circuit protection device should be able to quickly and reliably cut off the power supply, avoiding damage to the electrical equipment caused by the impact of short-circuit current. For example, protective devices such as fuses and circuit breakers can be installed in the circuit. When the current exceeds the set value, these devices will automatically disconnect the circuit, providing short-circuit protection.
Overcurrent protection: When the current exceeds the set current value of the device, the overcurrent protection circuit will automatically cut off the main power supply to protect the circuit and load. Overcurrent protection can be achieved by using devices such as overcurrent protectors and current sensors. For example, in some application scenarios with strict current requirements, current sensors monitor the current in real time, and once an abnormal increase in current is detected, the protection mechanism is immediately triggered.
Overpower protection: When the load experiences faults such as power supply overvoltage, rear load short circuit, or overcurrent that exceed the actual power, the overload protection circuit cuts off the main power supply through feedback circuit action to prevent the fault from expanding and protect the inverter and load equipment.
Undervoltage protection: When the line voltage drops to the critical voltage, the protective electrical device will activate to prevent equipment from burning out due to overload. For sine wave inverter power supplies, low input DC voltage may affect their normal operation and even damage the equipment, so undervoltage protection is necessary. Undervoltage protection can be achieved through a voltage monitoring circuit. When the voltage is detected to be lower than the set value, the inverter power supply will be turned off or an alarm signal will be issued.
Over temperature protection: The inverter generates heat during operation, and if the heat dissipation is poor or the ambient temperature is too high, it may cause the equipment temperature to be too high. When the temperature exceeds the flipping threshold, the over temperature protection device will turn off the power switch device to prevent critical components such as chips from being burned out. Usually, temperature sensors are used to monitor the temperature of equipment. When the temperature reaches the set upper limit, protective measures such as triggering the cooling fan to start or reducing the output power of the inverter are taken.
Structural protection:
Shell protection: Using sturdy and corrosion-resistant shell materials such as aluminum alloy, stainless steel, etc., can effectively protect internal circuit components from external physical impacts, dust, moisture, and other influences. At the same time, the casing should have good sealing to prevent water vapor, dust, etc. from entering the interior and affecting the normal operation of the equipment.
Shock absorption protection: During the installation of the inverter, shock absorbers such as shock pads and damping rods can be used to reduce damage to the equipment caused by vibration during operation. Especially in some mobile devices or places with high vibration environments, shock absorption protection is particularly important.
Heat dissipation protection: The inverter generates a large amount of heat during operation, so good heat dissipation is the key to ensuring its normal operation. Cooling devices such as fans and fins can be installed on the device to enhance air convection and improve heat dissipation efficiency. At the same time, it is necessary to ensure that the heat dissipation channels are unobstructed and avoid being blocked by dust, debris, etc., which may affect the heat dissipation effect.
Electromagnetic compatibility protection:
Filtering measures: Installing filters at the input and output terminals can effectively suppress electromagnetic interference, reduce the impact on other electronic devices, and also reduce the influence of external electromagnetic interference on the inverter power supply. For example, the filter at the power input can filter out clutter and interference signals in the power grid, while the filter at the output can reduce the harmonic components of the inverter output and improve the quality of the output electrical energy.
Shielding measures: Shield the internal circuits of the inverter by using metal shielding covers or layers to isolate sensitive circuits from the external electromagnetic environment, preventing electromagnetic radiation and interference from external electromagnetic signals. In addition, shielded cables should be used for signal and power lines to reduce electromagnetic interference during signal transmission.
Security protection:
Grounding protection: Proper grounding is an important measure to ensure personal safety and the normal operation of equipment. Reliable connection of the inverter casing, metal components, etc. to the ground can promptly introduce static electricity, leakage current, and other electrical currents from the equipment into the ground, avoiding electric shock to personnel and equipment damage.
Operating standards: Operators should strictly follow the requirements of the user manual to avoid safety accidents caused by misoperation. For example, when connecting input and output lines, ensure correct polarity and secure connection; During the operation of the inverter, do not open the chassis or touch internal circuit components at will.
Maintenance: Regularly maintain the inverter, check the operation status of the equipment, whether the connection lines are loose, and whether the heat dissipation device is normal. Timely identify and eliminate potential safety hazards to extend the service life of equipment.